add new examples

bin/concepts/main.cpp

@@ -0,0 +1,31 @@
+#include <set>
+
+#include "hack/logger/logger.hpp"
+#include "hack/concepts/concepts.hpp"
+
+template<hack::concepts::is_map T>
+void test_map(const T& m)
+{
+  hack::log()("is map", m);
+}
+
+template<hack::concepts::is_associative_container T>
+void test_associative(const T& m)
+{
+  hack::log()("is associative", m);
+}
+
+auto main(int argc, char *argv[]) -> int
+{
+  std::map<std::string, int> m { { "a", 1 }, { "b", 2 } };
+  test_map(m);
+  test_associative(m);
+
+  auto t = std::make_tuple("a", 1, "b", 2);
+  test_associative(t);
+
+  std::vector<int> v { 1, 2, 3 };
+  // test_associative(v); error !!!
+}
+
+